A magic eggshell: Cu2+ reacts with S2?/sup> to produce metal Cu, rather than CuS

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• 作者：WenLi Zhang (1)
  Zhao Wang (1)
  Bing Shao (1)
  Liang Ni (1)
  Lin Qiu (1)
  Shu Qiu (1)
  
• 关键词：copper ; eggshell ; copper chloride ; sodium sulfide
• 刊名：Chinese Science Bulletin
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：55
• 期：18
• 页码：1851-1853
• 全文大小：514KB
• 参考文献：1. Lakshminarayanan R, Loh X J, Gayathri S, et al. Biomacromolecules, 2006, 7: 3202-209 CrossRef
  2. Yang D, Qi L M, Ma J M. J Mater Chem, 2003,13: 1119-123 CrossRef
  3. Ajikumar P K, Lakshminarayanan R, Ong B T, et al. Biomacromolecules, 2003, 4: 1321-326 CrossRef
  4. Lee S J, Oh S H. Mater Lett, 2003, 57: 4570-574 CrossRef
  5. Tsai W T, Yang J M, Lai C W, et al. Bioresour Technol, 2006, 97: 488-93 CrossRef
  6. Vijayaraghavan K, Jegan J, Palanivelu K, et al. Miner Eng, 2005, 18: 545-47 CrossRef
  7. Beijing Normal University. Inorganic Chemistry. 4th ed. Beijing: Higher Education Press, 2002. 420-26
  
• 作者单位：WenLi Zhang (1)
  Zhao Wang (1)
  Bing Shao (1)
  Liang Ni (1)
  Lin Qiu (1)
  Shu Qiu (1)
  
  1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China
  
• ISSN：1861-9541

文摘

In common sense, the chemical reaction between Cu2+ and S2?/sup> ions produces black precipitation of CuS. However, if they are separated by an eggshell, they produce copper with trace amount of CuS on the surface of the eggshell at the side of copper chloride solution within one week. Such an unexpected phenomenon strongly indicated that Cu2+ is able to be reduced into metal copper when S2?/sup> diffuses throughout the porous eggshell. The produced copper was verified by reacting with nitric acid to generate red-brown nitrogen dioxide at ambient temperature, as well as by the powder X-ray diffraction (XRD) and energy dispersive analysis of X-rays (EDS).